Electronics Worksheet: If Else with Sensors

Electronics lesson 24: If / else with sensors · Set 818 · 40 questions

Remember (Test, then choose): Put the reading into the condition: true → the if part, false → the else part. > means strictly more and < strictly less; an equal reading makes them false. AND: both true. OR: at least one true. In a chain, the first true condition wins.

1. 1.🤖 if (sound > 60) { red LED ON } else { green LED ON }
   The sound sensor reads 63. What happens? (a) green LED ON (b) red LED ON
2. 2.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
   The temperature is 29 °C. What is shown? (a) Hot (b) Cool (c) Warm
3. 3.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 110 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
4. 4.🤖 if (light < 400) { lamp ON } else { lamp OFF }
   The light sensor reads 261. What happens? (a) lamp OFF (b) lamp ON
5. 5.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 560 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
6. 6.🤖 “if (A AND B)” is true when … (a) both are false (b) both A and B are true (c) only A is true (d) only B is true
7. 7.🤖 if (temperature > 25) { fan ON } else { fan OFF }
   The temperature sensor reads 23 °C. What happens? (a) fan OFF (b) fan ON
8. 8.🤖 if (moisture < 50) { pump ON } else { pump OFF }
   The soil moisture sensor reads 69 %. What happens? (a) pump OFF (b) pump ON
9. 9.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
   The temperature is 43 °C. What is shown? (a) Hot (b) Cool (c) Warm
10. 10.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 19 °C. What happens? (a) fan OFF (b) fan ON
11. 11.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 590 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
12. 12.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 130 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
13. 13.🤖 if (temperature > 28) { fan ON } else { fan OFF }
    The temperature sensor reads 26 °C. What happens? (a) fan OFF (b) fan ON
14. 14.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 26 °C. What happens? (a) fan ON (b) fan OFF
15. 15.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 17 °C. What is shown? (a) Hot (b) Warm (c) Cool
16. 16.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 36 °C. What is shown? (a) Cool (b) Hot (c) Warm
17. 17.🤖 if (distance < 10) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 15 cm. What happens? (a) buzzer is silent (b) buzzer beeps
18. 18.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 55. What happens? (a) green LED ON (b) red LED ON
19. 19.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 240 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
20. 20.🤖 if (distance < 10) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 4 cm. What happens? (a) buzzer is silent (b) buzzer beeps
21. 21.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 150 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
22. 22.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 10 cm. What happens? (a) buzzer is silent (b) buzzer beeps
23. 23.🤖 if (moisture < 40) { pump ON } else { pump OFF }
    The soil moisture sensor reads 47 %. What happens? (a) pump ON (b) pump OFF
24. 24.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 360 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
25. 25.🤖 if (sound > 80) { red LED ON } else { green LED ON }
    The sound sensor reads 98. What happens? (a) red LED ON (b) green LED ON
26. 26.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 590 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
27. 27.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 29 °C. What is shown? (a) Hot (b) Warm (c) Cool
28. 28.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 28 °C. What is shown? (a) Cool (b) Hot (c) Warm
29. 29.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 89. What happens? (a) lamp OFF (b) lamp ON
30. 30.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 67 %. What happens? (a) pump OFF (b) pump ON
31. 31.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) neither part (b) the if part (c) both parts (d) the else part
32. 32.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 30 °C. What is shown? (a) Warm (b) Cool (c) Hot
33. 33.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 38 °C. What is shown? (a) Hot (b) Cool (c) Warm
34. 34.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 33 %. What happens? (a) pump OFF (b) pump ON
35. 35.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 170 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
36. 36.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 57 %. What happens? (a) pump OFF (b) pump ON
37. 37.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 44 °C. What is shown? (a) Cool (b) Warm (c) Hot
38. 38.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 35 °C. What is shown? (a) Hot (b) Warm (c) Cool
39. 39.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 43 °C. What is shown? (a) Cool (b) Warm (c) Hot
40. 40.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 27 °C. What happens? (a) fan OFF (b) fan ON

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